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Zn Accumulation and Subcellular Distribution in the Zn Hyperaccumulator Sedurn alfredii Hance

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Pedosphere 2006年第5期16卷 616-623页

作者： LI Ting-Qiang yang xiao-e yang Jin-Yan He Zhen-Li MOe Key Laboratory of environment Remediation and ecosystem Health Zhejiang University Huajianchi Campus Hangzhou 310029 （China）

Zn accumulation and subcellular distribution in leaves of the hyperaccumulating ecotype （He） and non-hyperaccumulating ecotype （NHe） of Sedum alfredii Hance were studied using radiotracer and gradient centrifugation techniques. Leaf Zn accumulation in the He of S. alfredii was 18.5-26.7 times greater than that in the NHe when the plants were grown at 1-500μmol Zn L-1. Leaf section uptake of 65Zn was highly dependent on external Zn levels. Greater 65Zn uptake in He was noted only at external Zn levels 〉 100μmol L-1. Zinc subcellular distribution in the leaves of the two ecotypes of S. alfredii was： cell wall 〉 soluble fraction 〉 cell organelle. However, more Zn was distributed to the leaf cell wall and soluble fractions for He than for NHe. In the leaf of He, 91%-94% of the Zn was found in the cell walls and the soluble fraction and only 6%-9% Zn was distributed in the cell organelle fraction. For NHe, about 20%-26% Zn was recovered in the cell organelle fraction. In stems, Zn distribution to the ceil wail fraction was approximately two fold greater in the He than that in the NHe. For the hyperaccumulating ecotype of S. alfredii, the cell wall and the vacuole played a very important role in Zn tolerance and hyperaccumulation.

关键词： compartmentation Sedum alfredii Hance subcellular distribution Zn hyperaccumulator

Differential generation of hydrogen peroxide upon exposure to zinc and cadmium in the hyperaccumulating plant specie(Sedum alfredii Hance)

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2008年第3期9卷 243-249页

作者： Yue-en CHAO Min ZHANG Sheng-ke TIAN Ling-li LU xiao-e yang MOe Key Laboratory of environmental Remediation and ecosystem Health College of Environmental and Resource Sciences Zhejiang University Hangzhou 310029 China

Sedum alfredii Hance has been identified as zinc(Zn) and cadmium(Cd) *** this paper the relationships of Zn or Cd hyperaccumulation to the generation and the role of H2O2 in Sedum alfredii *** *** results show that Zn and Cd contents in the shoots of Sedum alfredii *** with 1000 μmol/L Zn2+ and/or 200 μmol/L Cd2+ increased linearly within 15 *** of total S,glutathione(GSH) and H2O2 in shoots also increased within 15 d,and then *** S and GSH contents in shoots were higher under Cd2+ treatment than under Zn2+ ***,reverse trends of H2O2 content in shoots were obtained,in which much higher H2O2 content was observed in Zn2+-treated shoots than in Cd2+-treated ***,the microscopic imaging of H2O2 accumulation in leaves using H2O2 probe technique showed that much higher H2O2 accumulation was observed in the Zn2+-treated leaf than in the Cd2+-treated *** results suggest that there are different responses in the generation of H2O2 upon exposure to Zn2+ and Cd2+ for the hyperaccumulator Sedum alfredii *** this is the first report that the generation of H2O2 may play an important role in Zn hyperaccumulation in the *** results also imply that GSH may play an important role in the detoxification of dissociated Zn/Cd and the generation of H2O2.

关键词： Hydrogen peroxide (H2O2) Glutathione (GSH) Sedum alfredii Hance Zinc (Zn) Cadmium (Cd) Hyperaccumulator

Heavy metal phytoextraction by Sedum alfredii is affected by continual clipping and phosphorus fertilization amendment

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Journal of environmental Sciences 2012年第3期24卷 376-386页

作者： Huagang Huang Tingqiang Li D.K.Gupta Zhenli He xiao-e yang Bingnan Ni Mao Li Ministry of education Key Laboratory of environmental Remediation and ecosystem Health Zhejiang UniversityHangzhou 310029China Departamento de Bioquimica Biologia Cellular y Molicular de PlantasEstacion Experimental del ZaidinCSICC/Profesor Albareda No 1E-180080GranadaSpain University of Florida Institute of Food and Agricultural SciencesIndian River Research and Education CenterFort PierceFlorida 34945USA

Improving the efficacy of phytoextraction is critical for its successful application in metal contaminated soils. Mineral nutrition affects plant growth and metal absorption and subsequently the accumulation of heavy metal through hyper-accumulator plants. This study assessed the effects of di-hydrogen phosphates （KH2PO4, Ca（H2PO4）2, NaH2PO4 and NH4H2PO4） application at three levels （22, 88 and 352 mg P/kg soil） on Sedum alfredii growth and metal uptake by three consecutive harvests on aged and Zn/Cd combined contaminated paddy soil. The addition of phosphates （P） significantly increased the amount of Zn taken up by S. alfredii due to increased shoot Zn concentration and dry matter yield （DMY）（P 〈 0.05）. The highest phytoextraction of Zn and Cd was observed in KH2PO4 and NH4H2PO4 treatment at 352 mg P/kg soil. The amount of Zn removed by phytoextraction increased in the order of 1st clipping 〈 2nd clipping 〈 3rd clipping, and for Cd extraction the order was 2nd clipping 〈 1st clipping 〈 3rd clipping. These results indicate that the application of P fertilizers coupled with multiple cuttings can enhance the removal of Zn and Cd from contaminated soils by S. alfredii, thus shortening the time needed for accomplishing remediation goals.

关键词： soluble phosphates clipping phytoremediation heavy metal Sedum alfredii

Improved cadmium uptake and accumulation in the hyperaccumulator Sedum alfredii:the impact of citric acid and tartaric acid

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2013年第2期14卷 106-114页

作者： Ling-li LU Sheng-ke TIAN xiao-e yang Hong-yun PeNG Ting-qiang LI Ministry of education Key Laboratory of environmental Remediation and ecological Health College of Environmental and Resource SciencesZhejiang University

The elucidation of a natural strategy for metal hyperaccumulation enables the rational design of technologies for the clean-up of metal-contaminated *** acid has been suggested to be involved in toxic metallic element tolerance,translocation,and accumulation in *** impact of exogenous organic acids on cadmium(Cd) uptake and translocation in the zinc(Zn)/Cd co-hyperaccumulator Sedum alfredii was investigated in the present *** the addition of organic acids,short-term(2 h) root uptake of 109 Cd increased significantly,and higher 109 Cd contents in roots and shoots were noted 24 h after uptake,when compared to *** 85% of the 109 Cd taken up was distributed to the shoots in plants with citric acid(CA) treatments,as compared with 75% within *** such effect was observed for tartaric acid(TA).Reduced growth under Cd stress was significantly alleviated by low ***-term application of the two organic acids both resulted in elevated Cd in plants,but the effects varied with exposure time and *** results imply that CA may be involved in the processes of Cd uptake,translocation and tolerance in ***,whereas the impact of TA is mainly on the root uptake of Cd.

关键词： Hyperaccumulation Cadmium Organic acid Sedum alfredii Translocation Uptake

Simultaneous removal of cadmium and sulfamethoxazole from aqueous solution by rice straw biochar

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2013年第7期14卷 640-649页

作者： Xuan HAN Cheng-feng LIANG Ting-qiang LI Kai WANG Hua-gang HUANG xiao-e yang Ministry of education Key Laboratory of environmental Remediation and ecological Health College of Environmental and Resource Sciences Zhejiang University School of Marine Sciences Ningbo University Tobacco Production Technology Center Bijie Tobacco Company of Guizhou Province

The simultaneous sorption behavior and characteristics of cadmium (Cd) and sulfamethoxazole (SMX) on rice straw biochar were investigated. Isotherms of Cd and SMX were well modeled by the Langmuir equation (R2 >0.95). The calculated maximum adsorption parameter (Q) of Cd was similar in single and binary systems (34129.69 and 35919.54 mg/kg, respectively). However, the Q of SMX in a binary system (9182.74 mg/kg) was much higher than that in a single system (1827.82 mg/kg). The presence of Cd significantly promoted the sorption of SMX on rice straw biochar. When the pH ranged from 3 to 7.5, the sorption of Cd had the characteristics of a parabola pattern with maximum adsorption at pH 5, while the adsorption quantity of SMX decreased with increasing pH, with maximum adsorption at pH 3. The amount of SMX adsorbed on biochar was positively correlated with the surface area of the biochar, and the maximum adsorption occurred with d 250 biochar (biochar with a diameter of 150-250 μm). Scanning electron microscopy (SeM) and Fourier transform infrared spectroscopy (FTIR) showed that the removal of Cd and SMX by rice straw biochar may be attributed to precipitation and the formation of surface complexes between Cd or SMX and carboxyl or hydroxyl groups. The results of this study indicate that rice straw biochar has the potential for simultaneous removal of Cd and SMX from co-contaminated water.

关键词： Biochar Rice straw Simultaneous sorption Cadmium (Cd) Sulfamethoxazole (SMX)

Cadmium accumulation in different pakchoi cultivars and screening for pollution-safe cultivars

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2012年第6期13卷 494-502页

作者： Ying CHeN Ting-qiang LI Xuan HAN Zhe-li DING xiao-e yang Ye-fei JIN Ministry of education Key Laboratory of environmental Remediation and ecological Health College of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China College of Life Sciences Shaoxing College o fArts and SciencesShaoxing 312000China

The selection and breeding of pollution-safe cultivars (PSCs) is a practicable and cost-effective approach to minimize the influx of heavy metal to the human food *** this study,both pot-culture and field experiments were conducted to identify and screen out cadmium pollution-safe cultivars (Cd-PSCs) from 50 pakchoi (Brassica rapa ***) cultivars for food *** treated with 1.0 or 2.5 mg/kg Cd,most of the pakchoi cultivars (>70%) showed greater or similar shoot biomass when compared with the *** result indicates that pakchoi has a considerable tolerance to soil Cd *** concentrations in the shoot varied significantly (Petween cultivars:in two Cd treatments (1.0 and 2.5 mg/kg),the average values were 0.074 and 0.175 mg/kg fresh weight (FW),*** concentrations in the shoots of 14 pakchoi cultivars were lower than 0.05 mg/kg *** pot-culture experiments,both enrichment factors (eFs) and translocation factors (TFs) of six pakchoi cultivars were lower than *** field studies further confirmed that the Hangzhouyoudonger,Aijiaoheiye 333,and Zaoshenghuajing cultivars are Cd-PSCs,and are therefore suitable for growth in low Cd-contaminated soils (≤1.2 mg/kg) without any risk to food safety.

关键词： Cadmium pollution Food safety Pakchoi Pollution-safe cultivars

Combined remediation of DDT congeners and cadmium in soil by Sphingobacterium sp.D-6 and Sedum alfredii Hance

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Journal of environmental Sciences 2012年第6期24卷 1036-1046页

作者： Hua Fang Wei Zhou Zhengya Cao Feifan Tang Dandan Wang Kailin Liu Xiangwei Wu xiao'e yang Yongge Sun Yunlong Yu Department of Plant Protection College of Agriculture & Biotechnology Zhefiang University Hangzhou 310058 China. E-mail: agri@*** Key Laboratory of Molecular Biology of Crop Pathogens and Insects Ministry of Agriculture Hangzhou 310058 China MOe Key Lab of environment Remediation & ecosystem Health College of Environmental and Resource Sciences Zhejiang University Hangzhou 310058 China Department of earth Science Zhejiang University Hangzhou 310027 China State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China

Combined pollution of 1,1,1-trichloro-2,2-bis （4-chlorophenyl） ethane （DDT） and cadmium （Cd） in agricultural soils is of great concern because they present serious risk to food security and human *** order to develop a cost-effective and safe method for the removal of DDTs and Cd in soil,combined remediation of DDTs and Cd in soil by Sphingobacterium sp.D-6 and the hyperaccumulator,Sedum alfredii Hance was *** treatment for 210 days,the degradation half-lives of DDTs in soils treated by strain D-6 decreased by 8.1% to 68.0% compared with those in the *** inoculation of strain D-6 into soil decreased the uptake of DDTs by pak choi and *** shoots/roots ratios of *** for the Cd accumulation ranged from 12.32 to *** Cd concentration in soil decreased to 65.8%-71.8% for *** treatment and 14.1%-58.2% for *** and strain D-6 combined treatment,respectively,compared with that in the *** population size of the DDTs-degrading strain,Simpson index （1/D） and soil respiratory rate decreased in the early stage of treatment and then gradually increased,ultimately recovering to or exceeding the initial *** results indicated that synchronous incorporation of strain D-6 and *** into soil was found to significantly （p 0.05） enhance the degradation of DDTs in soil and the hyperaccumulation of Cd in *** was concluded that strain D-6 and *** could be used successfully to control DDTs and Cd in contaminated soil.

关键词： bioremediation cadmium Sphingobacterium sp. Sedum alfredii Hance 1,1,1-trichloro-2,2-bis (4-chlorophenyl) ethane

extraction and isolation of the salidroside-type metabolite from zinc(Zn) and cadmium(Cd) hyperaccumulator Sedum alfredii Hance

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2012年第10期13卷 839-845页

作者： Yan XING Hong-yun PeNG Xia LI Meng-xi ZHANG Ling-ling GAO xiao-e yang Ministry of education Key Laboratory of environmental Remedia-tion and ecological Health College of Environmental and ResourceSciencesZhejiang UniversityHangzhou 310058China State Key Laboratory of Hydrology-Water Resources and Hydraulicengineering Hohai UniversityNanjing 210098China

The active metabolite in the post-harvested biomass of zinc(Zn) and cadmium(Cd) hyperaccumulator Sedum alfredii Hance from phytoextraction is of great interest in *** current study demonstrates that a salidroside-type metabolite can be yielded from the Zn/Cd hyperaccumulator *** biomass by means of sonication/ethanol extraction and macroporous resin column(AB-8 type) *** concentrations of Zn and Cd in the salidroside-type metabolite were below the limitation of the national standards.

关键词： Salidroside-type metabolite Isolation Hyperaccumulator Sedum alfredii Hance

Sorption of ammonium and phosphate from aqueous solution by biochar derived from phytoremediation plants

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2013年第12期14卷 1152-1161页

作者： Zheng ZeNG Song-da ZHANG Ting-qiang LI Feng-liang ZHAO Zhen-li He He-ping ZHAO xiao-e yang Hai-long WANG Jing ZHAO Muhammad Tariq RAFIQ Ministry of education Key Laboratory of environmental Remediation and ecological Health College of Environmental and Resource Sciences Zhejiang University Ningbo Raw Water Group Co. Ltd. Indian River Research and education Center Institute of Food and Agricultural Sciences University of Florida School of environmental and Resource Sciences Zhejiang A&F University

The study on biochar derived from plant biomass for environmental applications is attracting more and more attention. Twelve sets of biochar were obtained by treating four phytoremediation plants, Salix rosthornii Seemen, Thalia dealbata, Vetiveria zizanioides, and Phragmites sp., sequentially through pyrolysis at 500 °C in a N2 environment, and under different temperatures(500, 600, and 700 °C) in a CO2 environment. The cation exchange capacity and specific surface area of biochar varied with both plant species and pyrolysis temperature. The magnesium(Mg) content of biochar derived from T. dealbata(TC) was obviously higher than that of the other plant biochars. This biochar also had the highest sorption capacity for phosphate and ammonium. In terms of biomass yields, adsorption capacity, and energy cost, T. dealbata biochar produced at 600 °C(TC600) is the most promising sorbent for removing contaminants(N and P) from aqueous solution. Therefore, T. dealbata appears to be the best candidate for phytoremediation application as its biomass can make a good biochar for environmental cleaning.

关键词： Biochar Nutrient removal Plant species Pyrolysis temperature Water quality